Downtube cable stop for 70-80s Raleigh Mixte

Motivation

• original piece is injection molded plastic

• downtube cable stop for both front & rear shift lines

• broke, requiring a fairly janky setup to get it functionally working

  

• thankfully the original fractured part was still kept

  

  

  

  

Design

• I used to copy faithfully original parts, but for this part, there is virtually no reason other than period correctness to reproduce an injection molded part for which the mold is almost certainly decomissioned

• therefore, a 3DP FDM optimized part makes sense, especially for the quantities required

• there is some strange dovetail cutout on the original part for an unknown purpose

  • if I had to guess, it's for an accessory mount

  

• to be clear, this is a cable stop, so the housing terminates with ferrules at this point & the cable alone passes through the part

Improvements over original

• pass through slits enable replacement without fully disconnecting shift cables from their respective derailleurs

Hardware

• qty 1 M5 x ~14-16 mm CSKS

  

Compatibility

• may be compatible with other bikes

  • requires an M5 rivnut or braze on

  • originally, this is located on the bottom of the downtube

    

• downtube OD

  • many bikes of this age use a common 1.125" or 28.6 mm downtube

    

  • this can be trivially changed in the SLDPRT file

• I am guessing the age of the bike as some 1970-1980s

  • stem shifters

• picture here

  

• this may also fit 1986 Raleigh Technium frames – the OEM cable stops for those are slightly different

  

Ferrule dimensions

• designed around generic 4 mm plastic shift ferrules, which generally are very close in size & therefore interchangeable – see dimensions in the screenshot

  

  

Alternatives

• clamp type cable stops

• adhesive mounted cable stops

• vintage clamp type cable stops

  

Rev 2

• increases ferrule fit radially by .1 mm because it was a bit tight